We had to replace two bags while traveling across the country due to an incident with our cargo carrier. These were the only bags the Walmart we went to had. With only one review we weren't sure about them, but had no choice but to get them.I'm really glad we got them, we actually liked them better than the bags we lost. It got into the low 40s several nights and these bags were plenty warm enough with just shorts and a t-shirt. I'm sure they will be good down into the 30s. They are much more roomy than a standard mummy bag, and unzip all the way trough the foot box for when it warmer. Great bag, I plan on getting two more later to replace two other mummy bags I have.